linux-kernel - Re: [PATCH 12/45] KVM: x86: Support for user space injected NMIs

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Message-ID: <493D0E0A.2000400@siemens.com>
Date:	Mon, 08 Dec 2008 13:07:38 +0100
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Avi Kivity <avi@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 12/45] KVM: x86: Support for user space injected NMIs

Avi Kivity wrote:
> From: Jan Kiszka <jan.kiszka@...mens.com>
> 
> Introduces the KVM_NMI IOCTL to the generic x86 part of KVM for
> injecting NMIs from user space and also extends the statistic report
> accordingly.
> 
> Based on the original patch by Sheng Yang.
> 
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> Signed-off-by: Sheng Yang <sheng.yang@...el.com>
> Signed-off-by: Avi Kivity <avi@...hat.com>
> ---
>  arch/x86/include/asm/kvm_host.h |    2 +
>  arch/x86/kvm/x86.c              |   46 +++++++++++++++++++++++++++++++++++++-
>  include/linux/kvm.h             |   11 +++++++-
>  3 files changed, 55 insertions(+), 4 deletions(-)
> 

...

> diff --git a/include/linux/kvm.h b/include/linux/kvm.h
> index f18b86f..44fd7fa 100644
> --- a/include/linux/kvm.h
> +++ b/include/linux/kvm.h
> @@ -83,18 +83,22 @@ struct kvm_irqchip {
>  #define KVM_EXIT_S390_SIEIC       13
>  #define KVM_EXIT_S390_RESET       14
>  #define KVM_EXIT_DCR              15
> +#define KVM_EXIT_NMI              16
> +#define KVM_EXIT_NMI_WINDOW_OPEN  17
>  
>  /* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */
>  struct kvm_run {
>  	/* in */
>  	__u8 request_interrupt_window;
> -	__u8 padding1[7];
> +	__u8 request_nmi_window;
> +	__u8 padding1[6];
>  
>  	/* out */
>  	__u32 exit_reason;
>  	__u8 ready_for_interrupt_injection;
>  	__u8 if_flag;
> -	__u8 padding2[2];
> +	__u8 ready_for_nmi_injection;
> +	__u8 padding2;
>  
>  	/* in (pre_kvm_run), out (post_kvm_run) */
>  	__u64 cr8;

Avi, please consider [1] again. You've already merged the related user
space cleanup, and I was just waiting for your comment on how to deal
with the kernel part, ideally _before_ merging the superfluous
ready_for/request NMI interface into mainline.

Thanks,
Jan

[1] http://permalink.gmane.org/gmane.comp.emulators.kvm.devel/25016

-- 
Siemens AG, Corporate Technology, CT SE 26
Corporate Competence Center Embedded Linux
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